Portable cable local discharge detection device

Abstract

The invention relates to a portable cable local discharge detection device in the technical field of electric power detection. The portable cable local discharge detection device comprises a sensor, a detection terminal and a control module, wherein the input end of the sensor is connected with an electric cable for detection, the output end of the sensor is connected with the detection terminal for transmitting an analog sensing signal, and the control module is connected with the detection terminal for receiving the analog sensing signal and outputting a control instruction and a detection result. The invention has compact structure, convenient mobile detection because a box body is provided with a wheel structure, high working efficiency, higher sensitivity and signal to noise ratio, and can be applied to effectively detecting local discharge of a cross linked polyethylene (XLPE) cable on site by comprehensively applying four detection methods of a high-frequency current method, an ultrahigh frequency method, an ultrasonic method and an infrared temperature method.

Description

technical field [0001] The invention relates to a device in the technical field of electric power detection, in particular to a portable cable partial discharge detection device based on cross-linked polyethylene (XPLE). Background technique [0002] Cross-linked polyethylene (XLPE) power cables are widely used in urban power grids because of their good electrical properties and heat resistance, easy installation and laying, and are not limited by height drops, especially without the risk of oil leakage and fire. However, under the action of electricity, heat, mechanical external force, water, oil, organic compounds, acid, alkali, salt and microorganisms, power cables often age, affect insulation performance, and cause partial discharge; during the operation of the cable, due to internal The local electric field stress concentration caused by factors such as impurities, semiconductor protrusions, space charge accumulation under voltage, etc., will also cause partial discharg...

AI Technical Summary

Problems solved by technology

However, the traditional routine preventive test has a long cycle, and cannot effectively and timely find cable faults, which can no longer meet the needs of safe production. With more and more power cables put into operation, many units have been unable to complete routine preventive tests on time according to the regulations. , so how to accurately, quickly and economically detect the insulation condition of cables running on site has become an urgent problem to be solved, which is of great significance for improving the reliability of power supply in power systems and reducing economic losses caused by cable failures

[0003] After searching the prior art, it is found that the portable detection device for detecting partial discharge in live cables or equipment uses narrow-band radio frequency detectors with different electromagnetic probes to detect partial discharge signals in cables or equipment, and uses a volume meter to display partial discharge signals. However, this prior art only uses a single electric measurement method (radio frequency) to detect partial discharges, uses a volume meter to display the magnitude of the partial discharge signal, and the loudspeaker simulates the partial discharge signal. The detection process is more dependent on the experience of the operator and The validity of the results is difficult to judge

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